Merging PDFs in Node

Question

Hi i\'m trying to merge pdf\'s of total of n but I cannot get it to work.

I\'m using the Buffer module to concat the pdf\'s but it does only apply the last pdf

Answer 1

What do you expect to get when you do Buffer.concat([pdf1, pdf2])? Just by concatenating two PDFs files you won’t get one containing all pages. PDF is a complex format (basically one for vector graphics). If you just added two JPEG files you wouldn’t expect to get a big image containing both pictures, would you?

You’ll need to use an external library. https://github.com/wubzz/pdf-merge might work for instance.

Answer 2

HummusJS is another PDF manipulation library, but without a dependency on PDFtk. See this answer for an example of combining PDFs in Buffers.